This code does not work.

;; (define-module (gnu packages nextcloud)
;;   #:use-module (guix packages)
;;   #:use-module (gnu packages)
;;   #:use-module (gnu packages base)
;;   #:use-module (gnu packages code)
;;   #:use-module (gnu packages mail)
;;   #:use-module (guix download)  
;;   #:use-module ((guix licenses) #:prefix license:))

;; (define-public nextcloud
;;   (package
;;    (name "nextcloud")
;;    (version "20.0.4.zip")
;;    (source
;;     (origin
;;      (method url-fetch)
;;      (uri (string-append
;;            "https://download.nextcloud.com/server/releases/nextcloud-"
;;            version
;;            ".zip"))
;;      (sha256
;;       (base32
;;        "03m8rd88wgrbdnhyb34i3nlnyjcwj926z5768yrdssdy5li9hidk"))))
;;    (build-system trivial-build-system)
;;    (propagated-inputs
;;     `())
;;    (home-page
;;     "https://nextcloud.com")
;;    (synopsis "Nextcloud offers the industry-leading, on-premises
;; content collaboration platform.")
;;    (description
;;     "Nextcloud combines the convenience and ease of use of
;; consumer-grade solutions like Dropbox and Google Drive with the
;; security, privacy and control business needs.")
;;    (license license:agpl3+)))
